• Preheat oven to 350 degrees.
• Line a 9X13 baking dish with foil and then spray with non stick spray.
• In a large mixing bowl add flour, cocoa powder, baking soda, salt, sugar, and brown sugar.
• Mix with a mixer on low until combined.
• Add eggs and beat on medium until incorporated.
• Place the butter in a bowl and break apart the chocolate squares and add them on top.
• Heat on high in the microwave for 1 minute, then stir. Then heat for an additional minute.
• Stir until smooth and let cool for 5 minutes. *Heat for an additional 30 seconds if not fully melted.
• Stir in the vanilla to the melted butter mixture.
• With the mixer on low speed, slowly pour melted butter mixture into into the mixer bowl. Mix until incorporated.
• Gently stir in chocolate chips by hand. *Optional:you can roughly chop the chocolate chips into smaller pieces with a food processor.
• Scoop the mixture into the prepared pan, smoothing the batter out and filling in the corners.
• Bake for 23 minutes {exactly!}.
• Remove from oven and let cool before frosting.

For the Frosting:

• Add the butter to a medium bowl.
• Place chocolate chips on top.
• Pour the can of condensed milk on top.
• Heat in the microwave for 1 minute.
• Stir then heat for another minute.
• Let sit in microwave for 1 minute then remove and stir until smooth . If it's still not smooth then heat for another 30 seconds.
• Pour frosting over the top of the brownies, smoothing over the corners.
• Let cool until frosting is set.
• Cut into squares and serve.